Anything to anywhere
Throughout the war the ATA gained a reputation of being willing and able to fly anything ‘from anywhere, to anywhere.’
ATA pilots delivered new aircraft straight from factories and aircraft in need of repair were taken to and from Maintenance Units. They also ensured that the RAF and Fleet Air Arm had aircraft as and when needed.
The ATA divided aircraft types into six classes. If you could fly a specific type you were authorised to fly any aircraft in the same class.
A pdf of aircraft classes is available here.